of augsburg



May 26, 1931. w. KOLMER ET AL FORE GRIPPER MECHANI SM Filed Jan. 26, 1929 WW V/ Patented May 26, 1931 PATENT orrrca CORPORATION 01'' GERMANY T MA SCHINENFA BRIK 'AUGSBURG-NURNBERG A. G., OF AUGSBURG, GER-MANY, A

- FORE GRIPPER MECHANISM Application filed January 26, 1929, Serial No. 335,176,.and in' Ger many February 3, 1928.

The object of the invention is a feeding device' for two-revolution printing presses comprising-oscillating fore-grippers on a spindle journalled outside the impression 1 cylinder and parallel to it, for seizing the sheet fed and conveying it to the grippers in the impression cylinder.

In the new mechanismthe fore-gripper motion is controlled by means of a controlling roller which during the initiatory phase of the oscillating motion contacts with a cam which rotates twice at each impression and during the completing phase of the motion with a cam which rotates only once at each impression. Conformable to the-purpose the two-revolution cam in the new mechanism is fast on the cylinder shaft, and the one-revolution cam loose on this same shaft.

The drawing shows a side view of a preferred form of the new mechanism.

To the shaft of the impression cylinder a cam a is fastened; it consequently rotate twice at each impression.

A second cam b is rotatably disposed on a pivot projecting from cam a. Gear 0, is fastened to the main cam a and in mesh with gear (Z the circumference of wh1ch 1s double that of gear 0. Gear d is seated on the onerevolution shaft 6 and is fastened to gear f.

Gear 7 is in mesh with gear 9, the circumference of which is equal to that of gear f, and is fastened to cam b; cam Z) consequently revolves once at each impression. Lever i which oscillates about a pivot is projecting from the side frame of the machine carries intermediate its ends a roller h the motion of which is controlled by the two-revolution cam a during one phase of the oscillating movement of the grippers, that is,,while the i grippers seize the sheet on the feeding board of one-revolution cam b.

Lever i, which controlling roller 72. causes to oscillate, is at point Z pivotally, connected with rod m the other end of which is linked to a lever 0 by means of a pivot n. This lever 0 rocks about fore-gripper spindle p to which it is fastened. A spring 0 pressing at point q against the other end-of lever 0 forces roller it against the circumference of cams a and b. The other end of spring 1'- is fastened to the side frame of the machine.

Fastened to fore-gripperspindlc p are arms 10 in the ends of which bar u is journalled. Bar u carries the fore-grippers 8. They are opened and shut by means of an oscillating cam acting upon a, roller crank a" which is fastened to baru. Cam 6 is caused to oscillate by means of cam c which is fastened to gears d and f and rotates once at every impression on pivot 6 provided in the side frame of the machine, acting on roller lever w and through this-on lever w. When the sheet to be fed has slipped-into proper position and the fore grippers have arrived to seize it, the grippers s are opened, because,

at this moment cam t is situated at y de-' pressing the fore-gripper roller against'the action of spring a. Now cam 2? swings from position to position 1 Spring 2 causes the grippers to close and so grip the sheet; at this moment the conveying motion of the fore-grippers starts. Cam t has meanwhile arrived at position 1 and operated the trans ference of the sheet to the cylinder grippers. The fore-grippers close thereupon and move into the swung out position and cam't swings back to position y.

What we claim is: y p y 1. In a two-revolution printing press foregripper mechanism comprising in combination a two-revolution cam driven by; the main shaft ofthe machine and a one-revolution cam, a lever and a roller journalled in said lever adapted to contact with parts of the circumference ofeither of said cams.

2. In a two-revolution printing press foregripper mechanism compr sing in combina tlon a two-revolutlon cam fast on the main.

shaft, 2. one-revolution cam loose on the main shaft'and a roller adapted to contact alternately with parts of the circumference of either of said cams. v p e I 3. In a tWOdGVOlUtlOII prlnting' press forea one-revolution cam loose on main shaft, a lever, a roller adapted to contact alternately with parts of the circumference of either of said cams journalled in said lever, a fore-gripper spindle, means whereby the oscillations imparted by said cams to said lever are transmitted to said fore-gripper spindle, an additional one-revolution cam, gearing for operating said additional cam in accordance with aforesaid cams, an additional lever and a roller journalled in said additional lever adapted to contact with the circumference of said additional cam.

4. In a two-revolution printing press foregripper mechanism compising in combination, a two-revolution cam fast on main shaft, a OIIQJGVOlUl lOH cam loose on main shaft, a lever, a roller adapted to contact alternately w'th parts of the circumference of either of said cams journalled in said lever, a foregripper spindle, means whereby the oscillations imparted to said lever are transmitted to said fore-gripper spindle, an additional one-revolution cam, gearing for operating said additional cam in accordance with aforesaid cams, an additional lever, a roller journalled in said additional lever adapted to contact with the circumference of said additional cam, a fore-gripper bar, fore-grippers thereon, a cam loose on said fore-gripper spindle adapted to open said fore-grippers, and means whereby the oscillations of said additional lever are transmitted to said cam.

5. In a two-revolution printing press of the .character described, fore-gripper mechanism,

a two-revolution cam, a one-revolution cam, means for driving said cams at their respective relative speeds, and mechanism cooperating with both of said cams for actuating said fore-gripper mechanism.

6. In a two-revolution printing press of the character described, an oscillatory spindle, means for oscillating said spindle, forcgrippers mounted on said spindle for oscillatory movement therewith, and means for opening and closing said fore-grippers ineluding a cam loosely mounted on said foregripper spindle, and mechanism for actuating said cam independently of the oscillating means for said spindle.

7. In a two-revolution printing press of the character described, a spindle, fore-grippers pivotally mounted on said spindle, a two-revolution impression cylinder, two-revolution means for oscillating said fore grippers on the conveying stroke, one-revolution means for oscillating the fore-grippers to the swung out position, and means for opening and closing said fore-grippers including a cam loosely mounted on said fore-gripper spindle, and one-revolution means for oscillating said cam on said spindle.

8. In a printing press of the character described, oscillatory fore-gripper mechanism, means for oscillating said fore-gripper'mechanism, means for opening and closing said fore-gripper mechanism including an oscillatory member mounted for relative movement with respect to said fore-gripper mechanism, and means for oscillating said oscillatory member independently of the oscillating means for said fore-gripper mechanism.

9. In a printing press of the character described, fore-gripper mechanism having a predetermined cycle of operation, a cam, a second cam, means for driving said cams at different but coordinated rotative speeds, and mechanism for actuating said fore-gripper mechanism, said mechanism cooperating with said first mentioned cam during a predetermined part of the cycle of operation of said fore-gripper mechanism and with said second cam during a predetermined part of the cycle of operation of the fore-gripper mechanism.

In testimony whereof we have affixed our signatures.

lVILI-IELM KOLMER. ERHARD VVIRSCHINGER. 

